<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin:0;
            padding:0;
        }
        div{
            height:100px;
            width:100px;
            background-color: aqua;
            /* 左右(水平)居中：文本、行内元素、行内块*/
            text-align: center;
        }
        span{
            background-color: red;
        }
        img{
            height:20px;
            width:20px;
        }
    </style>
</head>
<body>
    <div>
       111
    </div>
    <div>
        <span>222</span>
    </div>
    <div>
        <img src="1_09.png" alt="">
    </div>
</body>
</html>